Over-reamer drilling tool for pilot bit



FIG. 1 is a fragmentary perspective view of an over-reamer drilling tool illustrating the invention,

FIG. 2 is a side elevational view of the over-reamer drilling tool of FIG. 1, and showing a pilot bit in phantom for environmental purposes,

FIG. 3 is a top plan view of the over-reamer tool of FIG. 1, and showing a pilot bit in phantom for environmental purposes, and,

FIG. 4 is a side elevational view, as rotated 90° from the FIG. 2 view, and showing a phantom pilot bit in an exploded position for illustration purposes. 

The ornamental design for an over-reamer drilling tool for pilot bit, as shown and described. 